/* Mednafen - Multi-system Emulator
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#include "mednafen.h"
#include "error.h"
#include <string.h>
#include <stdarg.h>
#include <trio/trio.h>

MDFN_Error::MDFN_Error() throw()
{
  abort();
}

MDFN_Error::MDFN_Error(int errno_code_new, const char *format, ...) throw()
{
  errno_code = errno_code_new;

  va_list ap;
  va_start(ap, format);
  error_message = trio_vaprintf(format, ap);
  va_end(ap);
}

MDFN_Error::~MDFN_Error() throw()
{
  if(error_message)
  {
    free(error_message);
    error_message = NULL;
  }
}

MDFN_Error::MDFN_Error(const MDFN_Error &ze_error) throw()
{
  if(ze_error.error_message)
    error_message = strdup(ze_error.error_message);
  else
    error_message = NULL;

  errno_code = ze_error.errno_code;
}

MDFN_Error& MDFN_Error::operator=(const MDFN_Error &ze_error) throw()
{
  char *new_error_message = ze_error.error_message ? strdup(ze_error.error_message) : NULL;
  int new_errno_code = ze_error.errno_code;

  if(error_message)
    free(error_message);

  error_message = new_error_message;
  errno_code = new_errno_code;

  return(*this);
}


const char * MDFN_Error::what(void) const throw()
{
  if(!error_message)
    return("Error allocating memory for the error message!");

  return(error_message);
}

int MDFN_Error::GetErrno(void) throw()
{
  return(errno_code);
}

static const char *srr_wrap(int ret, const char *local_strerror)
{
  if(ret == -1)
    return("ERROR IN strerror_r()!!!");

  return(local_strerror);
}

static const char *srr_wrap(const char *ret, const char *local_strerror)
{
  if(ret == NULL)
    return("ERROR IN strerror_r()!!!");

  return(ret);
}

void ErrnoHolder::SetErrno(int the_errno)
{
  local_errno = the_errno;

  if(the_errno == 0)
    local_strerror[0] = 0;
  else
  {
#ifdef HAVE_STRERROR_R
    const char *retv;

    retv = srr_wrap(strerror_r(the_errno, local_strerror, 256), local_strerror);

    if(retv != local_strerror)
      strncpy(local_strerror, retv, 255);

#else	// No strerror_r :(

    strncpy(local_strerror, strerror(the_errno), 255);

#endif

    local_strerror[255] = 0;
  }
}

